Blue-flame oil-burner.



' Patented Apr. 7, 1914.

R. HOFFMAN. BLUE FLAME OIL BURNER. APPLICATION r'ILBD Amm, 191s.

FICQQ [l'lllllllfllllllillllvhl UNITED STATES PATENT clarion;

RUDOLPH HOFFMAN, OF CHICAGO, ILLINOIS, SSIGNOB, TO SEARS, ROEBUCK COMPANY, F CHICAGO, ILLINOIS,A. CORPORATION OF NEW YORK.

BLUE-FLAME OILURNER.-

To all whom t may concern:

Be it known that I, RUDOLPH HOFFMAN, a citizen ofthe United States, residing at Chicago, in the county of Cook and 4State .of Illinois, have invented certain new and useful Improvements in Blue-Flame Oil-Burners, of which the following is a specification.

This invention relates to burners for burning kerosene and other` hydrocarbon oils to produce what is known as a blue flame.

The invention is herein shown as em-- bodied "n a burner which is especially adapted for use in a cook stove;

In the accompanying drawings, Figure 1 is a perspective view of a device embodyingthe features of my invention. Fig. 2 is a vertical central sectional view of the burner and the chimney. Figs. V3 and 4 are views illustrating a means for detachably connecting certain parts of the burner. Fig. 5 is a fragmental sectional view of the burner on a larger scale than that of Fig. 2. Fig. 6 is a fragmental sectional view of the wick .tubes' and the means for supporting thc 5 inner a.' controller.

The body 1 of the burner comprises an inner wick tube 2 and an outer wick tube 3 connected together at their lower ends so as to forma tubular receptacle for the wick 4 and a quantity of oil. The body may be connected to the oil reservoir by any preferred means, and may be mounted in the framework of the stove in'. any common or suitable manner, In the construction herein illustrated, the outer wick tube terminates in a horizontal plane slightly below the plane of the top of the inner wick tube, and the'upper end of the outer wick tube is preferably bent inwardly slightly, as shown. Air is admitted to the inner and outer sides of the annular flame produced by the wick, the air being controlled by an inner air controller and an outer air controller. The orin'o inner air controller 5 which has been selected for illustration is of generally frusto-conical form, the larger upper end of tlie controlLr being located approximately in the plane of the upper end of. the inner wick tube. Above the pla-ne ofthe largest diameter of the inner air controller is an annular flange 6 which first extends inwardly and upwardly and then outwardly.

7 is a disk which extends transversely of the inner air controller in the plane of thev largest diameter of said controller.

Sp ecicationof Letters lateiit. Appiicaon sied August s, i913. seriai Navs'asfia.

'or ring 8, said AND Patented Apr. 7, 1914.

-While the inner air controller may bel supported in various ways, it is herein shown as loosely supported concentrically with the wick tubes upon a cupped member the body l b means of a spider 9. Said spider may, if sheet-metal cross-bars other at right angles,'the ends of said bars being secured to the inner wick tube by means of solder or in any other suitable manner.

The ring 8 has -an outwardly extending annular flange 8 which causes the air current to flow upwardly close to the inner wick tube, said air current carrying up any vapors which might otherwise flow down gh?) inner wick tube and condense on said The outer air controller is of annular form and 1n the present embodiment consists oit' an inner'section 10 which is mounted upon and rigidly secured to the outer wick tube, and an outer section 11 which is detachably mounted upon the section 10.

The inner section 10 of the outer air controller comprises an annular horizontal lange 12 having perforations 13 or the like therein, and a vertical annular flange 14 having locking'projections 15 upon its upper edge. Each of these projections comprises a locking shoulder 16 and two oppositely-inclined surfaces 17 and 18.

The outer section 11 of the outer air conintersectiiig cach troller comprises an annular ring 19 having a shoulder 20 to support the chimney 21. Attached to the lower port-ion of the ring 19 is an annular iiange .22 havin0r perforations 23 therein. .At the inner edge of the Harige 22 is a downwardly-and outwardly inclined imperforate ange 24 adapted to rest. upon the flange 12. In the flange 22 is a plurality of slots 25, one for each ofthe locking projections l5. At. the inner edge of the flange 22 is an upwardly extending annular flange 26 encircling the outer wick tube and spaced a short distance therefrom in order to provide a'restrcted air passage 26a between the outer wick tube and said ange. The lower end of said passage communicates with the atmosphere through the pc-iforations 13. In order to restrict the flow of air upwardly through said passage, there may be placed in said passage, ashorein shown, a ring 27 having corrugations exring being supported within desired, be formed of two tending vertically thereof. The air current in the passage 26a prevents vapor from flow- 294 are above the wick tubes and terminate approximately' midway between the wick tubes. These flanges form between" them an air passage 30 through which air is directed in a downwardly inclined sheet against the flame. Air Ais admitted to said passage through perforations 31 in the flange 29.

Air is admitted to the flame through the space 32 between the flange 29 and the upper outwardly-ared portion of the flange 26 through the perforations 23 and 33 in the Aflange 22. The outwardly lared'edge of the ring 26 rotects the base ofthe liame :trom the relatlvely strong current Howing through the space 32.

The chimney 21 may be provided with a suitable window 34. When the burner is to be lighted, the operator o ens the Vwindow 34 and applies a match to t e wick. In order to facilitate the ignition of the Wick, the inner air controller 5 may, if desired, be tilted upon its seat 8. Theamount of air supplied through the passages 26, 30 and 32 and the Vspace between the inner wick tube and the inner air controller 5 is such that a blue llameis produced.

When it is desired to trim or replace the wick 4 therouter section 11 of the outerair controller is turned until the flange 22 is clear of the locking surfaces 16, the section 11 being then lifted off the wick tubes. After the wick has been trimmed or renewed, the sect-ion 11 is replaced, the inclined surfaces 17 and 18 guiding the flange 22 onto the locking projections 15. When the flange 24: rests upon the flange 12, the section 11 is turned by the operator in the direction to carry a portion of the flange 22 beneath each of the locking shoulders 16. I

Whilel have described the present em-l bodiment of m invention withconsiderable particularity, would have it understood that the invention is not limited to the precise arrangement of parts herein disclosed,

but that various modifications may be made by those skilled in the art without departing from the spirit and scope of the invention as .set forth in the appended claims.

I claim as m invention:

'1. In a blueame oil burner, the combination of inner end outer wick tubes; means for controlling the supply of air to the inner side of the flame; and means for controlling the supply of air to the outer side of the flame, the last mentioned means comprising an annular vertical flange surrounding and spaced from the outer wick tube and forming a restricted air passage, said flange eX- tending above the wick tube and having its upper portion flared outwardly, and two inwardly extending anges, one above the other, and both located above the first mentioned flange for directing a sheet of airY downwardly against the outer side of the flame.

2. In a blue-flame oil burner, the combination of inner and outer wick tubes; means for controlling the supply of air to the inner side of the llame; and means for controlling the supply of air Vto the outer side of the flame, the last mentioned means comprising an inner andan outer section, the inner section comprising a perforated flange fixed to the outerwick tube, and the outer section resting upon said flange and bein detachably connected to the inner section, said ing a limited amount -of air to the base of the flame, the air so y supplied .entering ,outer section comprising means for supplythrough the perforations in said ange, and

means thereabove for'directing a sheet ,of air against the outer side of the flame'.

3. In a blue-flame oil burner, the combina-A tion of inner and outer Wick tubes; means for controlling the su ply of air to the inner side of the flame; an means for controlling the supply of air to the outer. side of the flame, the last mentioned means comprising aninner and an outer section, the inner section comprising a horizontal perforated flange secured to the outer wick tube and a vertical flange havin a locking projection provided with a shouder, and the outer section comprising means for supplying alimited amount of air to the base of the flame, and means thereabove or'directing a sheet of. air againstthe outer side of the name, said outer section comprising a flange having a slot adapted to receive said locking projection, said outer section being adapted to be rotated to carry said flange beneath the shoulder of said locking projection.

4. In a blue-flame oil burner, the combination of inner and outer wick tubes; means for controlling the supply of vair to the inner side of the flame; and means for controlling the supply of air to the outer side of the flame, the last mentioned means comprising an annular ring encirclingthe-outer wick tube, a perforated annular flange, means cooperating with. said flange to support said ring, two annular flanges extending inwardly from said ring to a point above the wick tubes and adapted to direct a sheet of air against the outer side of the flame, and means for supplying a limited amount of airto the base of the flame.

. 5: In a blu eflame oil burner, the combination of lnner and outer wick tubes; means for controlling-.the supply of air to the inner side of the flame; and means for con- `trolling the supply of air to the outer side of the flame, the last mentioned means comprising an outwardly extending flan e se-A tion being provided with a shoulder, saidy outer section comprising a flange having a slot adapted-to receive said locking proJection, said outer section comprising a flange arranged to .rest upon said outwardly extending flange and having a slot adapted to receive .said locking progection, said outer section being adapted to be rotated to carry the slotted flange beneath the shoulder of v said locking projection.

6. In a blue-flame oil burner, the combination of inner and outer wick tubes; a frusto-conical member supported with its portion of greatest `diameterlocated substantially in the plane of the tops of the wick tubes, and having an inwardly and upwardly inclined flange above said portion of 1greatest diameter, and means located in the orizont-al plane of said flange for directing a sheet of airagainst the outer side of the flame, whereby the flame is caused to converge inwardly above said portion of greatest diameter.

7. In a blue-flame oil burner, the combination of inner and outer wick tubes; means for controlling the supply of air to the outer side of the flame; a: frusto-conical member for controlling the supply of air to the inner side ofthe flame, the portion of largest diameter of said member being substantially in the plane of the top of the wick tubes; and a cupped member rigidly secured to the inner vwick tube in whichvt-he smaller end ofl said frusto-conical member is loosely and removably seated.

8. In a blue-flame oil burner, the combination of inner and outer wick tubes; means for controlling the supply ofair to the inner side of the flame; and means for con-- trolling the supply of air to the outer side of the flame, the last mentioned means comprising a vertical flange encircling the outer wick tube and spaced relatively close thereto so as to form a restricted air passage, a vertically corrugated ring in said air passage; and means for directing a sheet of air against the outer side of the flame.

9. In a blue-flame oil burner, the combination of inner-and outer wick tubes; means .for controlling the supply ofair to the outer side of the flame; a frusto-conical member for controlling the supply of air to the inner side of the flame, the portion of said member of reatest diameter being approximately in t e horizontal plane of the tops ofthe wick tubes; a seat within the inner wick tube on which the lower, smaller end -of said member is supported; and an annular flange adjacent to the lower end of said member forconfining the air current to a position close to the inner wick tube.

l0. In a blue-dame oil burner, the combination of inner and outer wick tubes; means for controlling the supply of air to the inner side of the flame; and means for controlling the supply` of air to the outer side of the flame, the last mentioned means including an annular ring encircling the outer wick tube, a perforated annular flange extending inwardly from said ring, an annular perforated flange extending outwardly from and secured to the outer wick tube, said inwardly extending flange being removably supported upon said outwardly ex'- tending flange, an annular flange extending ing upwardly from the inner portion of' said inwardly extending flange and forming a restricted air passage around the outer wick tube, air being admitted to said passage through the perforationsv in said outwardly extending flange, and means above said upwardly extending flange for directing a sheet of air against the outer side of the flame.

l1. In a blue-flame oil burner, the combination of inner and outer Wick tubes; means for controlling the supply of air to the inner side of the flame; a flange extending outwardly from the outer wick tube; a vertically extending ring having near its lower edge an inwardly extending flange which is removably supported on the first flange, the second flange being perforated; a perforated flange attached to and extending inwardly from the ring and above the wick tubes; an imperforate flange attached to and extending inward from the ring above the third flange., said vimperforate flange and third flange forming means to direct a sheet of air against the outer side of the flame; an

' annular flange extending upwardly from the inner portion of the second flange and form ing a restricted air passage around the outer wick tube, the upper portion of said upwardly extending flange being flared and extending above the wick tubes and forming with the third flange an air passage.

In witness whereof I affix my signature in presence of two witnesses.

GEORGE L. CniNDAnL. 

